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Marine Weather and Tides Boulder Creek, CA Version 3.4

NOTICE 8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it. 8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue. 12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed. 10/9/2019 Updated the Marine Zones. 9/4/2019 Fixed the weather maps due to NOAA moving them. 7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

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Sunrise 6:57AM

Sunset 7:01PM

Friday September 25, 2020 7:18 AM PDT (14:18 UTC)

Moonrise 3:01PM

Moonset 12:00AM

Illumination 59%

NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.

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7 Day Forecast for Marine Location Near Boulder Creek, CA

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Area Discussion for - San Francisco/Monterey Bay Area, CA

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FXUS66 KMTR 251221 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 521 AM PDT Fri Sep 25 2020

SYNOPSIS. Quiet weather to wind out the work week with sunny skies and seasonable temperatures. Noted warming trend starts by Saturday afternoon as offshore winds begin to develop. Offshore winds increase Saturday night into Sunday morning with Red Flag Warnings now in effect for the North and East Bay hills for critical fire weather conditions. Winds will ease on Sunday but hot and dry weather across the region. A second burst of offshore winds Sunday night into Monday morning with very warm and dry air in place. Continued unseasonably hot and dry Monday and Tuesday with only gradual cooling by midweek. West coast ridge stays in place through early October with no rain in sight for the Bay Area.

DISCUSSION. as of 4:16 AM PDT Friday . No short term concerns this morning. Just some patchy clouds from Pt Reyes to Pacifica along the coast as well as some cloud development over in the East Bay early this morning. Expect continued low cloud formation through sunrise with onshore winds in place. We do have another cold front taking aim at Oregon and far Northern California later today into early Saturday but no impacts for the Bay Area. Looks like chamber of commerce weather to wind out the work week with seasonable temperatures in the 70s and 80s for most of the region.

Expect patchy clouds along the coast again Saturday morning as we wait for offshore winds to develop. That should start to happen throughout the day Saturday allowing for some inland warming. Favorable north winds should start to reach the North and East Bay later Saturday afternoon as highs warm into the upper 80s and lower 90s with humidities lowering as dry north winds begin to develop.

Have upgraded the Fire Wx Watch to a Red Flag Warning, set to start at 9 pm Saturday night for the North and East Bay hills as well as the East Bay interior valleys. The 00z/06z NAM runs have trended slightly stronger with widespread 925 mb winds pegged at 40 kt. As is usually the case these winds will first show up across the Napa hills sometime around 9-10 pm Saturday night. Humidity values will start out fairly moist, above 30% but drying will persist all night. Please note most locations below 2000 feet will feel little or no wind Saturday night but the winds aloft will be blowing strong and acting to dry the airmass out. By Sunday morning the dry air will really be filtering into the Bay Area as north winds come down the Sac valley and spill into the Bay Area. Expect no fog Sunday morning, except perhaps from Monterey southward. The offshore winds will keep drying things out Sunday as temps soar into the 90s and lower 100s.

The models have trended stronger with winds on Sunday night and by this time humidity values will be in the teens, almost regionwide. The main trough axis is now progged farther westward over the Rockies. This is dropping a little more cool air into the Great Basin but more importantly giving some upper support. In addition, the stronger surface pressure gradient is over the Sierra. And finally the 595 dm high to the northwest of Cape Mendocino will induce some subsidence aloft as well. Model cross sections now show north to northeast flow through much of the depth of the troposphere. To be clear this event is nowhere near the strength of the 2017 wine country, 2018 Camp or the 2019 Kincade fires. However the setup is still critical. In fact by Sunday night with the main sfc gradient over the Sierra we will get a pure east wind event. Though not progged explicitly by the models as east winds come off the Sierra they will make a beeline towards Mt Diablo and the North Bay. Again there will be no humidity recovery Sunday night and the models show east winds driving all the way to the coast and offshore. The setup is lacking cold advection but this is the type of pattern where we can see winds mix down into the I-880 corridor/Berkeley hills by Monday morning as well as to the lee of Mt Tamalpais with coastal gaps such as Hwy 92 to Half Moon Bay seeing locally strong east winds as well. All that to say the Red Flag Warning goes through 8 am Monday.

Beyond that an atypical late season ridge stays in place Monday through at least the middle of next week with temps staying well above normal. Will need to consider at least some possible Heat Advisories as the event gets closer. However, still believe the valleys and populated locations will see decent night time cooling while the hills will stay warm in the 70s and lower 80s at night.

Long range models show a very stable pattern with West Coast ridge in place all of next week as it bulges northward into British Columbia. Main trough axis over the Upper Midwest and over the Aleutians suggests little or no chance of rain through the first week of October as temps stay well above normal. Of course from late Sept through Columbus Day is often a time for offshore winds and no rain.

AVIATION. As of 05:22 AM PDT Friday . For the 12z TAFs. Mix of VFR/MVFR, except IFR along the San Mateo coast. Satellite night imagery shows patchy stratus developing along the coast, and in East Bay near KOAK and KLVK. Expecting patchy stratus to continue through the early morning hours with a mixed out marine layer. VFR should prevail from late morning through early evening for most of the Bay Area. Winds will be onshore and moderate, though gusty around KSFO. Shallow Marine layer expected to return Friday night, bringing MVFR/IFR cigs to coastal terminals.

Vicinity of KSFO . VFR with tempo MVFR cig through early morning, as coastal stratus tries to penetrate coastal gaps and wrap around the Bay. Scattered clouds may linger through the morning. Breezy westerly winds easing a bit through the morning and ramping up for the afternoon 20 to 25 kt with higher gusts through early evening.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR with light and variable winds through morning. Some low clouds possible in the morning hours with cigs possible but low confidence on that. WNW winds 10 to 15 knots for the afternoon with VFR conditions. Return of IFR cigs expected overnight into Saturday.

BEACHES. as of 4:00 PM PDT Thursday . A deep low in the Gulf of Alaska has produced a large long-period swell train that will impact the coastline through tomorrow afternoon. Swells by this afternoon 10 to 12 ft with a 15 to 16 second period. The main impacts will be increased wave heights breaking near the shoreline and an increased risk of rip currents developing along coastal beaches. This may produce breaking wave heights in the surf zone of 15 to 20 feet, particularly at west to northwest facing beaches. Therefore, a Beach Hazards Statement has been issued from 5 PM PDT this afternoon until 2 PM PDT Friday. With the increase in temperatures inland expected late in the week, beachgoers should be mindful of the increased wave activity and rip currents.The wave activity is forecast to subside into Friday evening.

CLIMATE. Here are the record high temperatures for Saturday through Monday .

. SATURDAY . SUNDAY . MONDAY SANTA ROSA . 103 in 2009 . 103 in 2010 . 104 in 2010 KENTFIELD . 99 in 2016 . 103 in 1921 . 102 in 1921 NAPA . 105 in 1963 . 101 in 1958 . 102 in 1966 RICHMOND . 97 in 2019 . 97 in 2010 . 97 in 2010 LIVERMORE . 103 in 1952 . 105 in 1963 . 105 in 2010 SAN FRANCISCO . 94 in 1992 . 93 in 2010 . 95 in 1966 SF AIRPORT . 95 in 1958 . 96 in 2010 . 95 in 2010 REDWOOD CITY . 99 in 1963 . 97 in 2010 . 98 in 2010 HALF MOON BAY . 90 in 1970 . 89 in 1966 . 91 in 1958 OAKLAND DOWNTOWN . 93 in 2016 . 95 in 1973 . 92 in 2010 SAN JOSE . 98 in 2016 . 98 in 1921 . 99 in 2010 GILROY . 104 in 1963 . 108 in 1963 . 101 in 1963 SANTA CRUZ . 101 in 1970 . 103 in 2010 . 100 in 1917 SALINAS . 101 in 2016 . 102 in 2010 . 99 in 1970 KING CITY . 105 in 1963 . 107 in 2010 . 102 in 1973

MARINE. as of 02:51 AM PDT Friday . High pressure will strengthen off the California coast resulting in increasing northwest winds that will last through Saturday night. A larger long period northwest swell will continue through Friday with swell heights of 10 to 13 feet at periods of 13 to 15 seconds. Swell heights are expected to diminish tonight.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Reyes to Pigeon Pt 0-10 nm SCA . Pigeon Pt to Pt Pinos 0-10 nm SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm SCA . Mry Bay from 3 PM



PUBLIC FORECAST: RWW AVIATION: Lorber MARINE: W Pi

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Weather Reporting Stations

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Stations	Dist	Age	Wind	Air Temp	Water Temp	Waves	Pressure	DewPt
46042 - MONTEREY - 27NM West of Monterey Bay, CA	25 mi	28 min	NW 9.7 G 14	59°F	55°F	11 ft	1016.9 hPa	58°F
RTYC1 - 9414523 - Redwood City, CA	26 mi	48 min	E 1.9 G 4.1	60°F	73°F		1016.9 hPa
46092 - MBM1	30 mi	69 min	NW 5.8	58°F	57°F		1016.1 hPa (+0.5)
46114 - West Monterey Bay, CA	30 mi	22 min			57°F	12 ft
MLSC1 - Moss Landing, South Harbor, CA	35 mi	110 min	ESE 2.9 G 8	53°F			1011.6 hPa	52°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA	35 mi	28 min	NW 12 G 18	61°F		12 ft	1017.3 hPa	60°F
ELXC1 - Elkhorn Slough Reserve, CA	36 mi	93 min	ESE 4.1	54°F				54°F
46240 - Cabrillo Point, Monterey Bay, CA (158)	40 mi	22 min			60°F	7 ft
MEYC1	42 mi	42 min	W 1.9 G 2.9	58°F	61°F		1017.3 hPa
AAMC1 - 9414750 - Alameda, CA	44 mi	48 min	W 5.1 G 8	60°F	68°F		1016 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA	46 mi	48 min	WSW 8 G 8.9
PXOC1 - 9414311 - San Francisco (Pier 1), CA	46 mi	48 min	SW 5.1 G 6	59°F			1014.8 hPa
LNDC1	46 mi	48 min	SW 4.1 G 5.1	60°F			1015.8 hPa
OBXC1	47 mi	48 min		61°F				60°F
OKXC1 - 9414776 - Oakland (Berth 34), CA	47 mi	48 min	SW 1.9 G 2.9	60°F			1015.8 hPa
PXSC1	47 mi	48 min		60°F
FTPC1 - 9414290 - San Francisco, CA	48 mi	48 min	SW 4.1 G 7	58°F	65°F		1016 hPa
46237 - San Francisco Bar, CA (142)	49 mi	48 min			60°F	10 ft

Wind History for Redwood City, CA

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NW9 G13

NW11 G15

NW12 G17

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W14 G17

W7 G11

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Airport Reports

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Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
Mountain View, Moffett Field, CA	24 mi	28 min	S 3	10.00 mi		59°F	50°F	72%	1016.6 hPa

Link to 5 minute data for KNUQ

Wind History from NUQ (wind in knots)

	8 AM	9 AM	10 AM	11 AM	12 PM	1 PM	2 PM	3 PM	4 PM	5 PM	6 PM	7 PM	8 PM	9 PM	10 PM	11 PM	12 AM	1 AM	2 AM	3 AM	4 AM	5 AM	6 AM	7 AM
Last 24hr	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	Calm	SW5	W3	Calm	Calm	Calm	Calm	S4
1 day ago	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	4	NW4	N3	Calm	Calm	Calm	NW8	Calm
2 days ago	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	N4	SE3	Calm	Calm	Calm	Calm	Calm	Calm

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Tide / Current Tables for Ano Nuevo Island, California

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Tide / Current Tables for Santa Cruz, California

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Weather Map

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GEOS Local Image of CentralWestCoast    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East

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Ground Weather Radar Station San Francisco Bay Area, CA

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